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Post by Deleted on Sept 9, 2007 8:56:50 GMT
Driving along the Euston Road recently, I wondered if there was much disturbance to the Met and Circle lines when the Euston Underpass was built (1970s I think). It must be pretty close to Euston Square station tunnels. Thanks, David Edit: Here is the flash earth link for the area around the Euston Unerpass: tinyurl.com/yw4cgd |
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Post by stanmorek on Sept 9, 2007 12:42:27 GMT
The C&H tunnels are to the south of the underpass at the point where it crosses under where Tottenham Court Rd and Euston Road meet. I suppose in theory by digging a trench next to the brick arch tunnel on one side only an imbalance of loads would occurr and cause the tunnel cross section to distort.
The A501 runs directly over Euston Square station where the existing tunnel has been strengthened due to increased road vehicle weights in the DOT standards in the 1960s. Strengthening work has been ongoing to covered ways and sub surface tunnels ever since especially to those carrying cast iron components. Work was done to a Blackfriars-Temple covered way only last year.
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Post by Deleted on Sept 9, 2007 17:05:37 GMT
Thank you for that information. Has re-enforcement work been carried out to the tunnel wall adjacent to the underpass then?
By the way, when was the Euston Underpass built?
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Post by Deleted on Sept 9, 2007 17:10:00 GMT
1960 - 1961, so says Wikipedia!
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Post by Deleted on Sept 9, 2007 20:37:15 GMT
1960 - 1961, so says Wikipedia! Coo - I didn't know it was as old as that |
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Post by Deleted on Sept 9, 2007 20:42:48 GMT
Don't take my word for it...
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Post by Deleted on Sept 9, 2007 20:48:02 GMT
Don't take my word for it... Well, I put Euston Underpass into Wikipedia and got nowt. London's roads (especially those that were never built) are another interest of mine - especially the Ringway 1 or Motorway Box. |
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Post by Deleted on Sept 9, 2007 20:57:54 GMT
It goes to Euston Road, halfway down roughly, it reads about modernised layout involved partial demolition of the Doric Arch at the entrance to the LNWR station...
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Post by Deleted on Sept 9, 2007 22:24:28 GMT
It goes to Euston Road, halfway down roughly, it reads about modernised layout involved partial demolition of the Doric Arch at the entrance to the LNWR station... says that the Arch was demolished in 1962 to allow the reconstruction of Euston Underground station as part of the Victoria line works. It would have to have been demolished anyway because of the reconstruction of Euston BR station. I doubt that the road works had much to do with it. |
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Post by Deleted on Sept 9, 2007 22:32:32 GMT
It goes to Euston Road, halfway down roughly, it reads about modernised layout involved partial demolition of the Doric Arch at the entrance to the LNWR station... says that the Arch was demolished in 1962 to allow the reconstruction of Euston Underground station as part of the Victoria line works. It would have to have been demolished anyway because of the reconstruction of Euston BR station. I doubt that the road works had much to do with it. IIRC, there is a vent of sorts in the area where the arch once was (between Melton Street and the bus station). It is black with a silver grille. You see it if you take the smoking route from the NR station to Euston Square station. |
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Post by stanmorek on Sept 22, 2007 11:23:23 GMT
Driving along the Euston Road recently, I wondered if there was much disturbance to the Met and Circle lines when the Euston Underpass was built (1970s I think). It must be pretty close to Euston Square station tunnels. I've had a look at the tunnel assessment report written in connection with the recent track replacement for Gt Portland St to Euston Square. It considers the underpass at it's deepest level as not close enough to affect the tunnels. Of the more interesting places on the Circle I've been to is covered way 75 between Barbican and Moorgate. 200m of track bed is on suspended slabs over a massive underground concrete box which was built when the Circle line was realigned for the Barbican development. The box also extends under the Thameslink line. I went down there with some engineers who were investigating why P-way had to keep on reballasting the track at a particular spot where the track had been sinking. It turned out that a couple of the bearings for the beams supporting the slabs had cracked and settled causing gaps to appear in the slabs. The specialised bearings were made from a rubberised material to minimise vibration to the Barbican Centre above. Much of the ballast that P-way had used to top up the track bed above had fallen to the bottom of the box and the was problem much worse in the Thameslink side. |
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Post by Deleted on Sept 22, 2007 12:01:56 GMT
Thanks for that; fascinating stuff. What exactly do you mean by the term 'covered way'? What happened to the original alignment of of the C&H tracks in the Barbican (Aldersgate) area?
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Post by tubeprune on Sept 22, 2007 19:43:32 GMT
Thanks for that; fascinating stuff. What exactly do you mean by the term 'covered way'? What happened to the original alignment of of the C&H tracks in the Barbican (Aldersgate) area? The original alignment was further north between Moorgate and the last bridge before Barbican. Moorgate bays were curved at the ends. All that area was open and as you left Moorgate the line veered right and then curved round to the left and then a slight right as it approached Barbican. I remember they diverted the old to the new route in a SUNDAY possession. Now they would want to shut down for 3 days weeks! |
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Post by stanmorek on Sept 24, 2007 21:44:36 GMT
As tubeprune says, the original alignment curved off to the north of the current tracks and swung back south to Moorgate. The Barbican Arts and Conference is on the site of the former tracks. The current Circle/Met and Thameslink lines follow a straight route after the Barbican Centre was built. However, the curved tunnels immediately to the east of Barbican station remain. David, I'm not sure of the origins of the term "covered way" but I've seen it used outside of railways to mean a covered over passage. As you know most of the Metropolitan and District tunnels were constructed using "cut and cover" method. Some were of a true brick arch construction. The covered ways were brick abutment walls with cast iron girders and jack arches forming a vaulted roof spanning between the abutments. I suppose the term covered way is used for structures not fitting the description of a tube or arched tunnel.  |
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Post by abe on Sept 26, 2007 7:00:27 GMT
This is definitely wandering OT now from the original post, but it's worth pointing out that the covered way between Barbican and Moorgate runs beneath the elongated lake in the middle of the Barbican complex. There are special channels above the railway box to guide any water that might leak away from the railway.
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